package services

import (
	"tyapi-server/internal/domains/article/entities"
)

// AnnouncementService 公告领域服务
// 处理公告相关的业务逻辑，包括验证、状态管理等
type AnnouncementService struct{}

// NewAnnouncementService 创建公告领域服务
func NewAnnouncementService() *AnnouncementService {
	return &AnnouncementService{}
}

// ValidateAnnouncement 验证公告
// 检查公告是否符合业务规则
func (s *AnnouncementService) ValidateAnnouncement(announcement *entities.Announcement) error {
	// 1. 基础验证
	if err := announcement.Validate(); err != nil {
		return err
	}

	// 2. 业务规则验证
	// 标题不能包含敏感词
	if s.containsSensitiveWords(announcement.Title) {
		return entities.NewValidationError("公告标题包含敏感词")
	}

	// 内容不能包含敏感词
	if s.containsSensitiveWords(announcement.Content) {
		return entities.NewValidationError("公告内容包含敏感词")
	}

	// 标题长度验证
	if len(announcement.Title) > 200 {
		return entities.NewValidationError("公告标题不能超过200个字符")
	}

	return nil
}

// CanPublish 检查是否可以发布
func (s *AnnouncementService) CanPublish(announcement *entities.Announcement) error {
	if announcement.Status == entities.AnnouncementStatusPublished {
		return entities.NewValidationError("公告已经是发布状态")
	}

	if announcement.Status == entities.AnnouncementStatusArchived {
		return entities.NewValidationError("已归档的公告不能发布")
	}

	// 检查必填字段
	if announcement.Title == "" {
		return entities.NewValidationError("公告标题不能为空")
	}
	if announcement.Content == "" {
		return entities.NewValidationError("公告内容不能为空")
	}

	return nil
}

// CanEdit 检查是否可以编辑
func (s *AnnouncementService) CanEdit(announcement *entities.Announcement) error {
	if announcement.Status == entities.AnnouncementStatusPublished {
		return entities.NewValidationError("已发布的公告不能编辑，请先撤回")
	}

	if announcement.Status == entities.AnnouncementStatusArchived {
		return entities.NewValidationError("已归档的公告不能编辑")
	}

	return nil
}

// CanArchive 检查是否可以归档
func (s *AnnouncementService) CanArchive(announcement *entities.Announcement) error {
	if announcement.Status != entities.AnnouncementStatusPublished {
		return entities.NewValidationError("只有已发布的公告才能归档")
	}

	return nil
}

// CanWithdraw 检查是否可以撤回
func (s *AnnouncementService) CanWithdraw(announcement *entities.Announcement) error {
	if announcement.Status != entities.AnnouncementStatusPublished {
		return entities.NewValidationError("只有已发布的公告才能撤回")
	}

	return nil
}

// CanSchedulePublish 检查是否可以定时发布
func (s *AnnouncementService) CanSchedulePublish(announcement *entities.Announcement, scheduledTime interface{}) error {
	if announcement.Status == entities.AnnouncementStatusPublished {
		return entities.NewValidationError("已发布的公告不能设置定时发布")
	}

	if announcement.Status == entities.AnnouncementStatusArchived {
		return entities.NewValidationError("已归档的公告不能设置定时发布")
	}

	return nil
}

// containsSensitiveWords 检查是否包含敏感词
func (s *AnnouncementService) containsSensitiveWords(text string) bool {
	// TODO: 实现敏感词检查逻辑
	// 这里可以集成敏感词库或调用外部服务
	sensitiveWords := []string{
		"敏感词1",
		"敏感词2",
		"敏感词3",
	}

	for _, word := range sensitiveWords {
		if len(word) > 0 && len(text) > 0 {
			// 简单的字符串包含检查
			// 实际项目中应该使用更复杂的算法
			if len(text) >= len(word) {
				for i := 0; i <= len(text)-len(word); i++ {
					if text[i:i+len(word)] == word {
						return true
					}
				}
			}
		}
	}

	return false
}